Finding the Fourth Proportional to 1,499.39, 2,069.61 and 870.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,499.39 : 2,069.61 = 870.07 : x
2. Step 2: Convert to fraction form
   1,499.39/2,069.61 = 870.07/x
3. Step 3: Cross multiply
   1,499.39x = 2,069.61 × 870.07
4. Step 4: Simplify right side
   1,499.39x = 1,800,705.57
5. Step 5: Solve for x
   x = 1,800,705.57/1,499.39
6. Step 6: Final answer
   x = 1,200.96